Cellular reservoir flexible pressure vessel, apparatus and method for making same

ABSTRACT

A cellular reservoir flexible pressure vessel is formed as a series of closely packed tubes fitted into a pair of opposing end caps. The end caps have individual receptacles sized and shaped to receive the tube ends that are secured with adhesive or radio frequency welding. At least one end cap has a passageway for connection of the vessel. The vessel may be formed in a variety of useful shapes and the tubes may have various internal and external cross-sections. The end caps may be filled with sintactic foam with canals leading to the passageway. Microtubes through the syntactic foam may connect the tubes to the passageway. The vessel is further strengthened by overwrapping with high-strength braiding material, hoop winding or by overlayment with high-strength fabric. The vessel is further strengthened by coating with plastic resin. Apparatus and methods for forming the cellular reservoir flexible vessels are described.

FIELD OF INVENTION

The invention pertains to devices for storing gases and fluids underpressure. More particularly, the invention relates to pressure vesselsthat are formed out of flexible materials and that can be made toconform to a variety of shapes.

BACKGROUND OF THE INVENTION

Typically, pressure vessels capable of containing liquids or gases atsignificant pressures have involved fixed shape cylinders or spheresformed of high-strength metals such as steel or aluminum. Such pressurevessels, while successful for their designed applications, involve anumber of problems. First, such metallic cylinders are relatively heavycompared to the gases or fluids that they contain. Second, pressurecylinders contain all of the gas or liquid in a single space. Should thevessel rupture, the entire vessel is destroyed, often with a violentexplosion sending shards of metal in all directions. Third, metalliccylinders have a definite shape and cannot be adapted to fit readily inmany space-constrained applications. The present invention involves anumber of small cells of an elongated tubular shape linked to each otherby collecting end caps. The result of this design is that the pressurevessel may be readily formed into a variety of useful shapes toaccommodate special applications. A pressure vessel of this type can belightweight, adaptable to a variety of spaces and unusual applications,and is inherently safer in rupture situations.

Various designs have been developed using elongated tubular shapedvessels, most in the area of radiators and heat exchangers. U.S. Pat.No. 6,390,187 issued to Marechal et al. discloses a heat exchanger withflexible tubes. The tubes may be made from a plastic material and aredesigned to carry a heat-exchanging fluid capable of cooperating with anair stream circulating through the exchanger. The invention is intendedto describe the method by which the tubes are maintained in parallelrows. The tubes are made from a plastic material and communicate by wayof their extremities with two manifolds. The manifolds include collectorplates equipped with apertures that thus form a means for holding thetubes in place. The tubes are arranged in rows that are parallel to oneanother by a distance corresponding to the tube thickness so that thevarious rows are adjacent in pairs of respective tubes of twoconsecutive pairs. The tubes generally exhibit a sinusoidal shape andthus aligned for expanding and contraction so that the tubes may utilizethe flexible characteristics and maintain the integrity of the system.

U.S. Pat. No. 4,450,902 issued to Bosne, is directed to a heat exchangerin particular for an atmospheric cooling tower. The exchanger utilizessynthetic plastic material for the tubes that has one fixed header whilethe remainder of the exchanger is mounted by suspension to allow forfree expansion. A chamber has a heat exchanger with a series of tubesextending throughout the length of chamber. The exchanger comprises abattery of smooth tubes made of a synthetic material. The tubes of theheat exchanger are fixed to the support structure at one of the ends andis freely suspended by a suspension members to allow for expansion andcontraction.

U.S. Pat. No. 5,158,134, issued to Mongia et al., discloses a fullyfloating tube bundle. The exchanger comprises a plurality of fluidcarrying tubes that is free floating with no direct contact between theend plates or center plate. Thus, the tubes are free to move withrespect to the end plates and center plate as to eliminate damage byvibration and temperature changes.

U.S. Pat. No. 4,114,683 issued to Verlinden describes a flexible tubetype fluid—fluid heat exchanger. The exchanger comprises a plurality offlexible synthetic tubes extending in a curved path between a pair ofheaders. The tubes are connected to headers and are constructed of aflexible plastic material so they may easily conform to the curvature ofthe wall 11.

U.S. Pat. No. 5,651,474 issued to Callaghan et al is directed tocryogenic structures that are vessels made of a durable plastic materialand are adapted to contain cryogenic materials such as fuel. Thestructures are made of a fiber network impregnated with a matrix ofthermal set plastics and have three tank lobes of a composite plasticreinforced with fibers. The tank lobes may be filament-wound on arotating mandrel while the fibers are pre-impregnated with resin.Another technique is to heat the tank skins allowing the pre-impregnatedfiber layers to fuse together and then cool so as to set up a solidmatrix that grips the fibers.

While other variations exist, the above-described designs involvingelongated tubular shaped vessels are typical of those encountered in theprior art. It is an objective of the present invention to provide aflexible pressure vessel that is capable of maintaining gasses orliquids at relatively high pressures. It is a further objective toprovide this capability in a vessel that is light in weight and thatpresents a significantly reduced risk of injury in rupture situations.It is a still further objective of the invention to provide a pressurevessel that may be easily adapted to a variety of space constraints. Itis yet a further objective to provide a pressure vessel that is durable,easily serviced, and that may be produced inexpensively.

While some of the objectives of the present invention are disclosed inthe prior art, none of the inventions found include all of therequirements identified.

SUMMARY OF THE INVENTION

A cellular reservoir flexible pressure vessel providing the desiredfeatures may be constructed from the following components. A pluralityof flexible tubes is provided. Each of the flexible tubes are formed ofresilient material and have an outer surface, an inner surface, a firstend and a second end.

First and second end caps are provided. Each of the end caps have areceptacle for either of the first or second ends of each of theflexible tubes, a collecting reservoir, a surrounding outer rim and anouter perimeter perpendicular to the surrounding outer rim. At least oneof the first and second end caps have a passageway connecting to thecollecting reservoir for connection to either a passageway of anotherpressure vessel or a valve. Each of the receptacles has a surroundingwall, a base and an orifice penetrating the base and connects thereceptacle to either the collecting reservoir or the passageway. Thewall has an interior surface. The interior surface is sized and shapedto fit frictionally over the outer surface of one of the flexible tubesat either the first or second ends. The collecting reservoir has anouter surface and connects the base of each of the receptacles to acommon space. The common space is either closed or connected to thepassageway. The surrounding outer rim extends outwardly from the outersurface of the collecting reservoir for a first predetermined distancealong the flexible tubes and serves to constrain the flexible tubes.

Means are provided for securing the first and second end caps to theflexible tubes. A valving means is provided. The valving means iscapable of controlling a flow of either a liquid or a gas through thepassageway and is attached to a distal end of the passageway. When theflexible tubes are inserted into the receptacles of the end caps andsecured thereto, a flexible pressure vessel will be formed capable ofcontaining either a liquid or a gas at high pressure.

In a variant of the invention, the means for securing the first andsecond end caps to the flexible tubes is selected from the groupcomprising: radio frequency welding, high-strength adhesive, mechanicalfastening and sonic welding.

In another variant of the invention, a protruding rim is provided. Theprotruding rim is located at the outer perimeter of the first and secondend caps and upper and lower receiving notches located above and belowthe protruding rim. A reinforcing ring is provided. The reinforcing ringhas an inner surface, an outer surface and is formed of high-strengthmaterial and is sized and shaped to fit tightly about the outerperimeter of the end cap. The reinforcing ring has an upper and lowerprojecting ribs and a central receiving notch located between the upperand lower projecting ribs. The projecting ribs are sized, shaped andlocated to fit the upper and lower receiving notches of the end cap. Thecentral receiving notch is sized, shaped and located to fit theprotruding rim of the end cap. The reinforcing ring has an aperture. Theaperture extends from the inner surface to the outer surface and issized, shaped and located to accommodate the passageway of the end cap.When the reinforcing ring is located about the outer perimeter of thefirst and second end caps, the pressure handling capacity of thepressure vessel is increased.

In yet a further variant of the invention, a protruding rim is provided.The protruding rim is located at the outer perimeter of the first andsecond end caps and upper and lower receiving notches located above andbelow the protruding rim.

Upper and lower reinforcing rings are provided. Each of the reinforcingrings have an inner surface, an outer surface and are formed ofhigh-strength material and are sized and shaped to fit tightly in eitherof the upper and lower receiving notches. At least one of thereinforcing rings has an aperture. The aperture extends from the innersurface to the outer surface and is sized, shaped and located toaccommodate the passageway connecting to the collecting reservoir. Whenthe reinforcing rings are located about the outer perimeter of the firstand second end caps, the pressure handling capacity of the pressurevessel is increased. Means are provided for fastening the upperreinforcing ring to the lower reinforcing ring.

In still a further variant of the invention, a protruding rim isprovided. The protruding rim is located at the outer perimeter of thefirst and second end caps. At least one groove located about the outerperimeter above the protruding rim is provided. At least one groovelocated about the outer perimeter below the protruding rim is provided.Upper and lower reinforcing rings are provided. Each of the reinforcingrings have an inner surface, an outer surface and are formed ofhigh-strength material and are sized and shaped to fit tightly about theouter perimeter on either side of the protruding rim. The reinforcingrings have at least one rib located upon the inner surface thereof, therib is sized, shaped and located to engage the groove. When thereinforcing rings are located about the outer perimeter of the first andsecond end caps, the pressure handling capacity of the pressure vesselis increased. Means are provided for fastening the upper reinforcingring to the lower reinforcing ring.

In yet a further variant of the invention a sintactic foam filler isprovided. The foam filler is located within the collecting reservoir ofat least one of the first and second end caps. The foam filler has aseries of canals through it. Each of the canals connects the orifice ofthe receptacle to the passageway. An opening in the end cap is provided.The opening provides means for introduction of the sintactic foam intothe end cap. A sealing plug is provided. The sealing plug is sized andshaped to fit sealably into the opening in the end cap. When thesyntactic foam is introduced into the end cap, the pressure handlingcapacity of the pressure vessel is increased.

In still a further variant of the invention, a sintactic foam filler isprovided. The foam filler is located within the collecting reservoir ofat least one of the first and second end caps. The foam is penetrated bya series of flexible microtubes. Each of the microtubes connects theorifice of the receptacle to the passageway. An opening in the end capis provided. The opening provides means for introduction of thesyntactic foam into the end cap. A sealing plug is provided. The sealingplug is sized and shaped to fit sealably into the opening in the endcap. When the microtubes are connected to the orifice of the receptaclesin the end cap, the purity of either liquids or gasses stored in thepressure vessel is increased.

In yet a further variant of the invention, an overwrapping ofhigh-strength braiding material is provided. The braiding materialextends over the flexible tubes and the first and second end caps. Whenthe flexible pressure vessel is so overwrapped, its pressure-handlingcapability will be increased.

In another variant, a plastic overcoating is provided. The overcoatingfurther increases the pressure-handling capability of the pressurevessel.

In still a further variant of the invention, a hoop winding withhigh-strength materials is provided. The hoop winding extends over theflexible tubes and the first and second end caps. When the flexiblepressure vessel is so hoop wound, its pressure-handling capability willbe increased.

In another variant, a plastic overcoating is provided. The overcoatingfurther increases the pressure-handling capability of the pressurevessel.

In yet a further variant of the invention, a first flexible blanket isprovided. The first blanket has an upper surface, a lower surface and issized and shaped to cover the pressure vessel and extends outwardlybeyond the outer edges thereof. The first blanket is fixedly attached atits lower surface to an upper surface of the pressure vessel. A secondflexible blanket is provided. The second blanket has an upper surface, alower surface and is sized and shaped to cover the pressure vessel andextends outwardly beyond the outer edges. The second blanket is fixedlyattached at its upper surface to a lower surface of the pressure vessel.When the first and second flexible blankets are attached to the pressurevessel, the pressure handling capability of the pressure vessel will beincreased.

In another variant, heavy duty stitching is used to attach the firstblanket to the second blanket. The stitching penetrates the first andsecond blankets and serves to further reinforce and increase thepressure-handling capabilities of the pressure vessel. In still anothervariant, the heavy duty stitching is high pressure hoop and lockbraiding.

In still a further variant of the invention, the cross-sectional shapeof the outer surface of the flexible tubing is selected from the groupcomprising: square, triangular, round, hexagonal, ovoid, octagonal andstar shaped.

In yet a further variant of the invention, the cross-sectional shape ofthe inner surface of the flexible tubing is selected from the groupcomprising: square, triangle, round, hexagonal, ovoid, octagonal, andstar-shaped.

In still a further variant of the invention, the cross-sectional shapeof the flexible pressure vessel is selected from the group comprising:square, triangular, round, hexagonal, ovoid, octagonal, pillow shaped,saddle shaped, and a flattened mat shape.

In yet a further variant of the invention, each of the receptacles areof a concave form selected from the group comprising: conical,dome-shaped, ellipsoid and stair-stepped. In a variant, the first andsecond ends of each of the flexible tubes are sized and shaped to fitsealably into the receptacles.

In still a further variant of the invention, upper and lower reinforcingpanels are provided. The reinforcing panels are formed of high-strengthwoven material and are shaped as a form to cover at least half of asurface area of the pressure vessel with extensions projecting from aperimeter of the form. The reinforcing panels are joined to the outersurface of the pressure vessel, thereby increasing the pressure handlingcapability of the pressure vessel.

In a variant, the method of adhesion is selected from the groupcomprising: high-strength adhesive, sonic welding and RF welding.

In another variant, the woven material is prepregnated with eitheradhesive or laminating material and subjected to heat and pressure.

An apparatus for fabricating a cellular reservoir flexible pressurevessel may be constructed from the following components. A raw plasticstorage and feeding unit is provided. The storage and feeding unitcontains a supply of raw plastic. A multi-head extruder is provided. Theextruder includes a heating facility and is in communication with thefeeding unit. A cooling tank is provided. The cooling tank is locateddownstream from the extruder. A power puller is provided. The pullerserves to pull a tubing bundle from the cooling tank. Core tubingforming dies are provided. The forming dies form the tubing bundle intoa predetermined shape. A binder head is provided. The binder head has anattached binder tank containing liquid binder material. A binderapplicator is provided. The binder applicator comprises a secondaryforming die and serves to affix the binder material to the tubingbundle. A cutting unit is provided. The cutting unit comprises a lasercalibration facility and serves to cut the tubing bundle to apredetermined length. A conveyer facility is provided. The conveyerfacility comprises means for positioning a cut tubing bundle. A rotatinghead and ram is provided. The head comprises a glue head applicator. Theglue head applicator attaches to a glue tank. A plurality of preformedend caps are provided. An automated end cap loader is provided. The endcap loader positions the plurality of end caps. An automated end capinstaller attached to the automated end cap loader is provided. Theinstaller serves to attach the end caps to the tubing bundle. Ahigh-intensity UV lamp assembly is provided. The lamp assembly serves tocure the glue.

In a variant of the apparatus for fabricating a cellular reservoirflexible pressure vessel, a plurality of reinforcing rings is provided.The reinforcing rings are formed of high-strength material. Areinforcing ring auto loader is provided. A swivel ram is provided. Theram comprises of a ring loading and placement head. The swivel ram is incooperation with the ring auto loader and serves to press thereinforcing ring onto the pressure vessel.

In another variant of the apparatus for fabricating a cellular reservoirflexible pressure vessel, either a gas or liquid supply tank isprovided. An auto loader test head is provided. The test head isadaptable to fittings on the end caps. A cryogenic test unit incommunication with the test head is provided. The test head and the testunit provides means for pressurizing the pressure vessel.

In yet a further variant of the apparatus for fabricating a cellularreservoir flexible pressure vessel, a reinforcing blanket material isprovided. A glue spraying mechanism is provided. The mechanism comprisesof glue tanks, glue spray heads and glue for attaching the blanketmaterial to the pressure vessel. A blanket material feed mechanism isprovided. A press forming tool is provided. The tool is adapted to formthe blanket material over the cut tubing bundle and the attached endcaps. In a variant, a high-strength thread is provided. A stitching headis provided. The stitching head is adapted to sew the high-strengththread through the reinforcing blanket material.

In still a further variant of the apparatus for fabricating a cellularreservoir flexible pressure vessel includes a high-strength braidingmaterial. A braider is provided. The braider is adapted to position andprovide overwrapping of the pressure vessel with the braiding material.A binder spraying mechanism is provided. The spraying mechanismcomprises of a binder tank, a binder spray head and binder material.

In yet a further variant of the apparatus for fabricating a cellularreservoir flexible pressure vessel, a high-strength reinforcing ribbonis provided. An automated reinforcing ribbon winding machine isprovided. The winding machine comprises of a reinforcing ribbon spooland an auto layout ribbon head. A binder spraying mechanism is provided.The spraying machine comprises of a binder tank, a binder spray head andbinder material.

In still a further variant of the apparatus for fabricating a cellularreservoir flexible pressure vessel, means are provided for pulling aseries of high tensile strength core wires through orifices inreceptacles in the end cap to a passageway in the end cap. Means areprovided for injecting sintactic foam through an opening in the end cap.Means are provided for attaching a sealing plug to the opening. Meansare provided for removing the core wires from the end cap. When the corewires are removed from the end cap, a series of canals will be formed inthe sintactic foam connecting orifices in receptacles in the end cap tothe passageway.

In yet a further variant of the apparatus for fabricating a cellularreservoir flexible pressure vessel, means are provided for attaching aseries of flexible microtubes to orifices in receptacles in the end capto a passageway in the end cap. Means are provided for injectingsintactic foam through an opening in the end cap. Means are provided forattaching a sealing plug to the opening. Means are provided for removingthe core wires from the end cap. When the microtubes are connected tothe passageway, the pressure vessel will provide an ultra cleanenvironment for either liquids or gasses.

In still a further variant of the apparatus for fabricating a cellularreservoir flexible pressure vessel, means are provided for forming aconcave receptacle having a shape selected from the group comprising:conical, dome-shaped, ellipsoid and stair-stepped. In a variant, meansare provided for forming the first and second ends of each of theflexible tubes to fit sealably into the receptacles.

In yet a further variant of the apparatus for fabricating a cellularreservoir flexible pressure vessel, means are provided for forming upperand lower reinforcing panels. The reinforcing panels are formed ofhigh-strength woven material and are shaped as a form to cover at leasthalf of a surface area of the pressure vessel with extensions projectingfrom a perimeter from the form. Means are provided for adhering thereinforcing panel to the outer pressure vessel, thereby increasing thepressure handling capability of the pressure vessel.

In a variant of the apparatus for fabricating a cellular reservoirflexible pressure vessel, the method of adhesion is selected from thegroup comprising: high-strength adhesive, sonic welding and RF welding.

In a final variant of the apparatus for fabricating a cellular reservoirflexible pressure vessel, the woven material is prepregnated with eitheradhesive or laminating material and subjected to heat and pressure.

DESCRIPTION OF THE DRAWINGS

FIG. 1 is a plan view of a first embodiment of the inventionillustrating cellular reservoir cells, first and second end caps, aconnecting passageways and a valve;

FIG. 2 is a cross-sectional view of the FIG. 1 embodiment taken alongthe line 2—2;

FIG. 2A is an end cross-sectional view of the FIG. 1 embodiment takenalong the line 2A—2A;

FIG. 3 is an end view of the FIG. 1 embodiment taken along the line 3—3illustrating a first embodiment of a reinforcing ring, an aperture inthe ring and a cross-section of the ring in partial cutaway;

FIG. 3A is a side elevational view of the FIG. 1 embodiment,illustrating a first embodiment of upper and lower reinforcing rings;

FIG. 4 is a partial cross-sectional view of the FIG. 3A embodiment takenalong the line 4—4;

FIG. 5 is a partial cross-sectional view of the FIG. 3A embodimentillustrating a means for fastening the upper and lower reinforcing ringstogether;

FIG. 6 is a partial cross-sectional view of a second embodiment of upperand lower reinforcing rings illustrating grooves and ribs for attachingthe rings;

FIG. 7 is a partial cross-sectional view of a third embodiment of upperand lower reinforcing rings illustrating grooves and ribs for attachingthe rings and means for attaching the rings together;

FIG. 8 is a cross-sectional view of an end cap illustrating means forintroducing sintactic foam into the end cap and wires for forming canalsthrough the foam;

FIG. 9 is a cross-sectional view of an end cap illustrating microtubesconnecting the receptacles to the passageway and a sealing plug forclosing the end cap after introduction of the syntactic foam;

FIG. 10 is a side elevational view of the FIG. 1 embodiment illustratingan overwrapping of high-strength braiding material;

FIG. 11 is a side elevational view of the FIG. 1 embodiment illustratinghoop winding;

FIG. 12 is a partial cross-sectional view of the FIG. 1 embodimentillustrating a plastic overcoating;

FIG. 13 cross-sectional view of the FIG. 1 embodiment illustratingflexible blankets attached to the pressure vessel;

FIG. 14 is a plan view of the FIG. 1 embodiment illustratinghigh-strength stitching of the flexible blankets;

FIG. 15A is a cross-sectional view of a cellular reservoir tube having ahexagonal external cross-section;

FIG. 15B is a cross-sectional view of a cellular reservoir tube having asquare external cross-section;

FIG. 15C is a cross-sectional view of a cellular reservoir tube having aequilateral triangular external cross-section;

FIG. 15D is a cross-sectional view of a cellular reservoir tube havingan oval external cross-section;

FIG. 15E is a cross-sectional view of a cellular reservoir tube having aright triangular external cross-section;

FIG. 15F is a cross-sectional view of a cellular reservoir tube having around external cross-section;

FIG. 15G is a cross-sectional view of a cellular reservoir tube having aoctagonal external cross-section;

FIG. 15H is a cross-sectional view of a cellular reservoir tube having astar-shaped external cross-section;

FIG. 16A is a cross-sectional view of a cellular reservoir tube having ahexagonal internal cross-section;

FIG. 16B is a cross-sectional view of a cellular reservoir tube having asquare internal cross-section;

FIG. 16C is a cross-sectional view of a cellular reservoir tube having aequilateral tringular internal cross-section;

FIG. 16D is a cross-sectional view of a cellular reservoir tube havingan oval internal cross-section;

FIG. 16E is a cross-sectional view of a cellular reservoir tube having aright triangular internal cross-section;

FIG. 16F is a cross-sectional view of a cellular reservoir tube having around internal cross-section;

FIG. 16G is a cross-sectional view of a cellular reservoir tube having aoctagonal internal cross-section;

FIG. 16H is a cross-sectional view of a cellular reservoir tube having astar-shaped internal cross-section;

FIG. 17A is a cross-sectional view of a cellular reservoir flexiblepressure vessel having a hexagonal shape;

FIG. 17B is a cross-sectional view of a cellular reservoir flexiblepressure vessel having a square shape;

FIG. 17C is a cross-sectional view of a cellular reservoir flexiblepressure vessel having an equilateral triangular shape;

FIG. 17D is a cross-sectional view of a cellular reservoir flexiblepressure vessel having an oval shape;

FIG. 17E is a cross-sectional view of a cellular reservoir flexiblepressure vessel having an airfoil shape;

FIG. 17F is a cross-sectional view of a cellular reservoir flexiblepressure vessel having a right triangular shape;

FIG. 17G is a cross-sectional view of a cellular reservoir flexiblepressure vessel having a round shape;

FIG. 17H is a cross-sectional view of a cellular reservoir flexiblepressure vessel having a octagonal shape;

FIG. 17I is a cross-sectional view of a cellular reservoir flexiblepressure vessel having a saddle shape;

FIG. 17J is a cross-sectional view of a cellular reservoir flexiblepressure vessel having a flat mat shape;

FIG. 18A is a cross-sectional view of a receptacle and fittingsquare-shaped flexible tube end;

FIG. 18B is a cross-sectional view of a receptacle and fittingcone-shaped flexible tube end;

FIG. 18C is a cross-sectional view of a receptacle and fittinghemi-spherical-shaped flexible tube end;

FIG. 18D is a cross-sectional view of a receptacle and fittingstep-shaped flexible tube end;

FIG. 18E is a cross-sectional view of a receptacle and fittingbullet-shaped flexible tube end;

FIG. 19 is a side elevational view of the FIG. 1 embodiment enclosed inupper and lower reinforcing panels;

FIG. 20 is a plan view of the FIG. 1 embodiment on upper and lowerreinforcing panels prior to attachment;

FIG. 21 is a side elevational view of an apparatus for fabricatingflexible tubes for a cellular reservoir flexible pressure vessel;

FIG. 22 is a side elevational view of an apparatus for cutting the tubesto length and attaching the end caps;

FIG. 23 is a side elevational view of an apparatus for curing theadhesive for the flexible tubes and attaching the reinforcing rings;

FIG. 24 is a side elevational view of apparatus for filling the vesselwith cryogenic liquid or gas, attaching high-strength blanket materialand stitching high-strength thread through the reinforcing blanketmaterial;

FIG. 25 is a side elevational view of an apparatus for overwrapping ofthe pressure vessel with high-strength braiding material;

FIG. 26 is a side elevational view of an apparatus for hoop windingreinforcing ribbon onto the pressure vessel;

FIG. 27 is a side cross-sectional view of an apparatus for pulling wiresinto the end cap prior to injection of syntactic foam to leave canals;

FIG. 28 is a side cross-sectional view of an apparatus for pullingmicrotubes into the end cap prior to injection of syntactic foam;

FIG. 29 is a detailed side cross-sectional view of an apparatus forforming a concave receptacle having a dome shape;

FIG. 29A is a side cross-sectional view of an apparatus for a series ofconcave receptacles having a dome shape;

FIG. 30 is a side cross-sectional view of an apparatus for forming thefirst and second ends of each of said flexible tubes to fit sealablyinto said receptacles;

FIG. 31 is a perspective view of an apparatus for forming reinforcingpanels; and

FIG. 32 is a perspective view of an apparatus for applying adhesive to areinforcing panel.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT

(1) A cellular reservoir flexible pressure vessel 10 providing thedesired features, as shown in FIG. 1, FIG. 2 and FIG. 2A, may beconstructed from the following components. A plurality of flexible tubes15 is provided. Each of the flexible tubes 15 are formed of resilientmaterial 20 and has an outer surface 25, an inner surface 30, a firstend 35 and a second end 40.

First 45 and second 50 end caps are provided. Each of the end caps 45,50 has a receptacle 55 for either of the first 35 or second 40 ends ofeach of the flexible tubes 15, a collecting reservoir 70, a surroundingouter rim 75 and an outer perimeter 80 perpendicular to the surroundingouter rim 75. At least one of the first 45 and second 50 end caps has apassageway 85 connecting to the collecting reservoir 70 for connectionto either a passageway 85 of another pressure vessel 10 or a valve 90.Each of the receptacles 55 has a surrounding wall 95, a base 100 and anorifice 105 penetrating the base 100. The orifice 105 connects thereceptacle 55 to either the collecting reservoir 70 or the passageway85. The wall 95 has an interior surface 110. The interior surface 110 issized and shaped to fit frictionally over the outer surface 25 of one ofthe flexible tubes 15 at either the first 35 or second 40 ends. Thecollecting reservoir 70 has an outer surface 115 and connects the base100 of each of the receptacles 55 to a common space 120. The commonspace 120 is either closed or connected to the passageway 85. Thesurrounding outer rim 75 extends outwardly from the outer surface 115 ofthe collecting reservoir 70 for a first predetermined distance 125 alongthe flexible tubes 15 and serves to constrain the flexible tubes 15.

Means 130 are provided for securing the first 45 and second 50 end capsto the flexible tubes 15. A valving means 135 is provided. The valvingmeans 135 is capable of controlling a flow of either a liquid or a gasthrough the passageway 85 and is attached to a distal end 150 of thepassageway 85. When the flexible tubes 15 are inserted into thereceptacles 55 of the end caps 45, 50 and secured thereto, a flexiblepressure vessel 10 will be formed capable of containing either a liquidor a gas at high pressure.

(2) In a variant of the invention, the means for securing the first 45and second 50 end caps to the flexible tubes 15 is selected from thegroup comprising: radio frequency welding, high-strength adhesive,mechanical fastening and sonic welding.

(3) In another variant of the invention, as shown in FIG. 3, aprotruding rim 180 is provided. The protruding rim 180 is located at theouter perimeter 80 of the first 45 and second 50 end caps and upper 185and lower 190 receiving notches located above and below the protrudingrim 180. A reinforcing ring 195 is provided. The reinforcing ring 195has an inner surface 200, an outer surface 205 and is formed ofhigh-strength material 206. The reinforcing ring 195 is sized and shapedto fit tightly about the outer perimeter 80 of the end caps 45, 50. Thereinforcing ring 195 has an upper 210 and lower 215 projecting ribs anda central receiving notch 220 located between the upper 210 and lower215 projecting ribs. The projecting ribs 210, 215 are sized, shaped andlocated to fit the upper 185 and lower 190 receiving notches of the endcaps 45, 50. The central receiving notch 220 is sized, shaped andlocated to fit the protruding rim 180 of the end caps 45, 50. Thereinforcing ring 195 has an aperture 225. The aperture 225 extends fromthe inner surface 200 to the outer surface 205 and is sized, shaped andlocated to accommodate the passageway 85 of the end caps 45, 50. Whenthe reinforcing ring 195 is located about the outer perimeter 80 of thefirst 45 and second 50 end caps, the pressure handling capacity of thepressure vessel 10 is increased.

(4) In yet a further variant of the invention, as shown in FIG. 3A andFIG. 4, a protruding rim 180 is provided. The protruding rim 180 islocated at the outer perimeter 80 of the first 45 and second 50 endcaps. Upper 185 and lower 190 receiving notches are provided. The upper185 and lower 190 receiving notches are located above and below theprotruding rim 180.

Upper 230 and lower 235 reinforcing rings are provided. Each of thereinforcing rings 230, 235 has an inner surface 240, an outer surface245 and is formed of high-strength material 246. The upper 230 and lower235 reinforcing rings are sized and shaped to fit tightly in either ofthe upper 185 and lower 190 receiving notches. At least one of thereinforcing rings 230, 235 has an aperture 250. The aperture 250 extendsfrom the inner surface 240 to the outer surface 245 and is sized, shapedand located to accommodate the passageway 85 connecting to thecollecting reservoir 70. When the reinforcing rings 230, 235 are locatedabout the outer perimeter 80 of the first 45 and second 50 end caps, thepressure handling capacity of the pressure vessel 10 is increased.

(5) In another variant of the invention, as shown in FIG. 5, means 255are provided for fastening the upper reinforcing ring 230 to the lowerreinforcing ring 235.

(6) In still a further variant of the invention, as shown in FIG. 6, aprotruding rim 180 is provided. The protruding rim 180 is located at theouter perimeter 80 of the first 45 and second 50 end caps. At least onegroove 260 located about the outer perimeter 80 above the protruding rim180 is provided. At least one groove 260 located about the outerperimeter 80 below the protruding rim 180 is provided. Upper 230 andlower 235 reinforcing rings are provided. Each of the reinforcing rings230, 235 has an inner surface 240, an outer surface 245 and is formed ofhigh-strength material 246. Each of the upper 230 and lower 235reinforcing rings is sized and shaped to fit tightly about the outerperimeter 80 on either side of the protruding rim 180. Each of thereinforcing rings 230, 235 has at least one rib 265 located upon theinner surface 240 thereof. The rib 265 is sized, shaped and located toengage the groove 260. When the reinforcing rings 230, 235 are locatedabout the outer perimeter 80 of the first 45 and second 50 end caps, thepressure handling capacity of the pressure vessel 10 is increased.

(7) In another variant of the invention, as shown in FIG. 7, means 255are provided for fastening the upper reinforcing ring 230 to the lowerreinforcing ring 235.

(8) In yet a further variant of the invention, as shown in FIG. 8, asintactic foam filler 270 is provided. The foam filler 270 is locatedwithin the collecting reservoir 70 of at least one of the first 45 andsecond 50 end caps. The foam filler 270 has a series of canals 275through it. Each of the canals 275 connects the orifice 105 of thereceptacle 55 to the passageway 85. An opening 285 in the end caps 45,50 is provided. The opening 285 provides means 286 for introduction ofthe foam filler 270 into the end caps 45, 50. A sealing plug 290 isprovided. The sealing plug 290 is sized and shaped to fit sealably intothe opening 285 in the end caps 45, 50. When the foam filler 270 isintroduced into the end caps 45, 50, the pressure handling capacity ofthe pressure vessel 10 is increased.

(9) In still a further variant of the invention, as shown in FIG. 9, asintactic foam filler 270 is provided. The foam filler 270 is locatedwithin the collecting reservoir 70 of at least one of the first 45 andsecond 50 end caps. The foam 271 is penetrated by a series of flexiblemicrotubes 291. Each of the microtubes 291 connects the orifice 105 ofthe receptacle 55 to the passageway 85. An opening 285 in the end caps45, 50 is provided. The opening 285 provides means 286 for introductionof the sintactic foam 271 into the end caps 45, 50. A sealing plug 290is provided. The sealing plug 290 is sized and shaped to fit sealablyinto the opening 285 in the end caps 45, 50. When the microtubes 291 areconnected to the orifices 105 of the receptacles 55 in the end caps 45,50, the purity of either liquids or gasses stored in the pressure vessel10 is increased.

(10) In yet a further variant of the invention, as shown in FIG. 10, anoverwrapping of high-strength braiding material 295 is provided. Thebraiding material 295 extends over the flexible tubes 15 and the first45 and second 50 end caps. When the flexible pressure vessel 10 is sooverwrapped, its pressure-handling capability will be increased.

(11) In still a further variant of the invention, as shown in FIG. 11, ahoop winding 305 with high-strength materials 306 is provided. The hoopwinding 305 extends over the flexible tubes 15 and the first 45 andsecond 50 end caps. When the flexible pressure vessel 10 is so hoopwound, its pressure-handling capability will be increased.

(12) In another variant, as shown in FIG. 12, a plastic overcoating 300is provided. The overcoating 300 further increases the pressure-handlingcapability of the pressure vessel 10.

(13) In yet a further variant of the invention, as shown in FIG. 13, afirst flexible blanket 310 is provided. The first blanket 310 has anupper surface 315, a lower surface 320 and is sized and shaped to coverthe pressure vessel 10. The first flexible blanket 310 extends outwardlybeyond the outer edges 325 thereof. The first blanket 310 is fixedlyattached at its lower surface 320 to an upper surface 330 of thepressure vessel 10. A second flexible blanket 335 is provided. Thesecond blanket 335 has an upper surface 340, a lower surface 345 and issized and shaped to cover the pressure vessel 10. The second flexibleblanket 335 extends outwardly beyond the outer edges 326 thereof. Thesecond blanket 335 is fixedly attached at its upper surface 340 to alower surface 355 of the pressure vessel 10. When the first 310 andsecond 335 flexible blankets are attached to the pressure vessel 10, thepressure handling capability of the pressure vessel 10 will beincreased.

(14) In another variant, as shown in FIG. 14, heavy duty stitching 360is used to attach the first blanket 310 to the second 335 blanket. Thestitching 360 penetrates the first 310 and second blankets 335 andserves to further reinforce and increase the pressure-handlingcapabilities of the pressure vessel 10.

(15) In still another variant, as shown in FIG. 14, the heavy dutystitching 360 is high pressure hoop and lock braiding 380.

(16) In still a further variant of the invention, as shown in FIG. 15A,FIG. 15B, FIG. 15C, FIG. 15D, FIG. 15E, FIG. 15F, FIG. 15G and FIG. 15H,the cross-sectional shape 385 of the outer surface 25 of the flexibletubing 15 is selected from the group comprising: square 390, triangular395, round 400, hexagonal 405, ovoid 410, octagonal 415 and star shaped420.

(17) In yet a further variant of the invention, as shown in FIG. 16A,FIG. 16B, FIG. 16C, FIG. 16D, FIG. 16E, FIG. 16F, FIG. 16G and FIG. 16H,the cross-sectional shape 425 of the inner surface 30 of the flexibletubing 15 is selected from the group comprising: square 390, triangle395, round 400, hexagonal 405, ovoid 410, octagonal 415, and star-shaped420.

(18) In still a further variant of the invention, as shown in FIG. 17A,FIG. 17B, FIG. 17C, FIG. 17D, FIG. 17E, FIG. 17F, FIG. 17G, FIG. 17H,FIG. 17I and FIG. 17J, the cross-sectional shape 430 of the flexiblepressure vessel 10 is selected from the group comprising: square 390,triangular 395, round 400, hexagonal 405, ovoid 410, octagonal 415,pillow shaped 470, saddle shaped 475, and a flattened mat shape 480.

(19) In yet a further variant of the invention, as shown in FIG. 18A,FIG. 18B, FIG. 18C, FIG. 18D and FIG. 18E, each of the receptacles 55are of a concave form 485 selected from the group comprising: conical490, dome-shaped 495, ellipsoid 500 and stair-stepped 505.

(20) In a variant, as shown in FIG. 18A, FIG. 18B, FIG. 18C, FIG. 18Dand FIG. 18E, the first 45 and second 50 ends of each of the flexibletubes 15 are sized and shaped to fit sealably into the receptacles 55.

(21) In still a further variant of the invention, as shown in FIG. 19and FIG. 20, upper 510 and lower 515 reinforcing panels are provided.The reinforcing panels 510, 515 are formed of high-strength wovenmaterial 520 and are shaped as a form 525 to cover at least half of asurface area 526 of the pressure vessel 10 with extensions 530projecting from a perimeter 535 of the form 525. The reinforcing panels510, 515 are joined to the outer surface of the hollow pressure cell 10,thereby increasing the pressure handling capability of the pressurevessel 10.

(22) In a variant, the method of adhesion is selected from the groupcomprising: high-strength adhesive, sonic welding and RF welding.

(23) In another variant, the woven material 520 is prepregnated witheither adhesive or laminating material and subjected to heat andpressure.

(24) An apparatus for fabricating a cellular reservoir flexible pressurevessel 10 may be constructed, as shown in FIG. 21, FIG. 22 and FIG. 23,from the following components. A raw plastic storage and feeding unit580 is provided. The storage and feeding unit 580 contains a supply ofraw plastic 585. A multi-head extruder 590 is provided. The extruder 590includes a heating facility 595 and is in communication with the feedingunit 580. A cooling tank 600 is provided. The cooling tank 600 islocated downstream from the extruder 590. A power puller 605 isprovided. The puller 605 serves to pull a tubing bundle 610 from thecooling tank 600. Core tubing forming dies 615 are provided. The formingdies 615 form the tubing bundle 610 into a predetermined shape 616. Abinder head 620 is provided. The binder head 620 has an attached bindertank 625 containing liquid binder material 640. A binder applicator 635is provided. The binder applicator 635 comprises a secondary forming die640 and serves to affix the binder material 630 to the tubing bundle610. A cutting unit 645 is provided. The cutting unit 645 comprises alaser calibration facility 650 and serves to cut the tubing bundle 610to a predetermined length 655. A conveyer facility 660 is provided. Theconveyer facility 660 comprises means 665 for positioning a cut tubingbundle 610. A rotating head and ram 670 is provided. The head 670comprises a glue head applicator 675. The glue head applicator 675attaches to a glue tank 680. A plurality of preformed end caps 45, 50are provided. An automated end cap loader 690 is provided. The end caploader 690 positions the plurality of end caps 45, 50. An automated endcap installer 691 attached to the automated end cap loader 690 isprovided. The installer 691 serves to attach the end caps 45, 50 to thetubing bundle 610. A high-intensity UV lamp assembly 695 is provided.The lamp assembly 695 serves to cure the glue 700.

(25) In a variant of the apparatus for fabricating a cellular reservoirflexible pressure vessel 10, as shown in FIG. 23, a plurality ofreinforcing rings 195 is provided. The reinforcing rings 195 are formedof high-strength material 206. A reinforcing ring auto loader 710 isprovided. A swivel ram 715 is provided. The ram 715 comprises of a ringloading and placement head 720. The swivel ram 715 is in cooperationwith the ring auto loader 710 and serves to press the reinforcing ring195 onto the pressure vessel 10.

(26) In another variant of the apparatus for fabricating a cellularreservoir flexible pressure vessel 10, as shown in FIG. 24, either a gasor liquid supply tank 730 is provided. An auto loader test head 735 isprovided. The test head 735 is adaptable to fittings on the end caps 45,50. A cryogenic test unit 740 in communication with the test head 735 isprovided. The test head 735 and the test unit 740 provides means 745 forpressurizing the pressure vessel 10.

(27) In yet a further variant of the apparatus for fabricating acellular reservoir flexible pressure vessel 10, as shown in FIG. 24,reinforcing blanket material 750 is provided. A glue spraying mechanism755 is provided. The mechanism 755 comprises glue tanks 760, glue sprayheads 765 and glue for attaching the blanket material 750 to thepressure vessel 10. A blanket material feed mechanism 775 is provided. Apress forming tool 780 is provided. The tool 780 is adapted to form theblanket material 750 over the cut tubing bundle 610 and the attached endcaps 45, 50.

(28) In a variant, as shown in FIG. 24, a high-strength thread 785 isprovided. A stitching head 790 is provided. The stitching head 790 isadapted to sew the high-strength thread 785 through the reinforcingblanket material 750.

(29) In still a further variant of the apparatus for fabricating acellular reservoir flexible pressure vessel 10, as shown in FIG. 25,includes a high-strength braiding material 795. A braider 800 isprovided. The braider 800 is adapted to position and provideoverwrapping 805 of the pressure vessel 10 with the braiding material795. A binder spraying mechanism 810 is provided. The spraying mechanism810 comprises a binder tank 815, a binder spray head 820 and bindermaterial 825.

(30) In yet a further variant of the apparatus for fabricating acellular reservoir flexible pressure vessel 10, as shown in FIG. 26, ahigh-strength reinforcing ribbon 830 is provided. An automatedreinforcing ribbon winding machine 835 is provided. The winding machine835 comprises of a reinforcing ribbon spool 840 and an auto layoutribbon head 841. A binder spraying mechanism 810 is provided. Thespraying mechanism 810 comprises a binder tank 815, a binder spray head820 and binder material 825.

(31) In still a further variant of the apparatus for fabricating acellular reservoir flexible pressure vessel 10, as shown in FIG. 27,means 850 are provided for pulling a series of high tensile strengthcore wires 855 through orifices 105 in receptacles 55 in the end caps45, 50 to a passageway 85 in the end caps 45, 50. Means 870 are providedfor injecting sintactic foam 270 through an opening 285 in the end caps45, 50. Means 880 are provided for attaching a sealing plug 290 to theopening 285. Means 890 are provided for removing the core wires 855 fromthe end caps 45, 50. When the core wires 855 are removed from the endcaps 45, 50, a series of canals 275 will be formed in the sintactic foam270 connecting orifices 105 in receptacles 55 in the end caps 45, 50 tothe passageway 85.

(32) In yet a further variant of the apparatus for fabricating acellular reservoir flexible pressure vessel 10, as shown in FIG. 28,means 900 are provided for attaching a series of flexible microtubes 291to orifices 105 in receptacles 55 in the end caps 45, 50 to a passageway85 in the end caps 45, 50. Means 870 are provided for injectingsintactic foam 270 through an opening 285 in the end caps 45, 50. Means880 are provided for attaching a sealing plug 290 to the opening 285.Means 925 are provided for removing the core wires 855 from the end caps45, 50. When the microtubes 291 are connected to the passageway 85, thepressure vessel 10 will provide an ultra clean environment for eitherliquids or gasses.

(33) In still a further variant of the apparatus for fabricating acellular reservoir flexible pressure vessel 10, as shown in FIG. 29 andFIG. 29A, means 930 are provided for forming a concave receptacle 935having a shape selected from the group comprising: conical 490,dome-shaped 495, ellipsoid 500 and stair-stepped 505.

(34) In a variant, a shown in FIG. 30, means 960 are provided forforming the first 35 and second 40 ends of each of the flexible tubes 15to fit sealably into the receptacles 55.

(35) In yet a further variant of the apparatus for fabricating acellular reservoir flexible pressure vessel 10, as shown in FIG. 31,means 940 are provided for forming upper 510 and lower reinforcingpanels 515. The reinforcing panels 510, 515 are formed of high-strengthwoven material 520 and are shaped as a form 525 to cover at least halfof a surface area 526 of the pressure vessel 10 with extensions 530projecting from a perimeter 535 of the form 525. Means 531 are providedfor adhering the reinforcing panels 510, 515 to the outer surface of thehollow pressure vessel 10, thereby increasing the pressure handlingcapability of the pressure vessel 10.

(36) In a variant, as shown in FIG. 32, the method of adhesion isselected from the group comprising: high-strength adhesive 945, sonicwelding (not shown) and RF welding (not shown).

(37) In a final variant, the woven material 520 is prepregnated witheither adhesive or laminating material and subjected to heat andpressure.

What is claimed is:
 1. A cellular reservoir flexible pressure vessel,comprising: a plurality of flexible tubes, each of said tubes beingformed of resilient material and having an outer surface, an innersurface, a first end and a second end; first and second end caps, eachof said end caps having a receptacle for either of the first and secondends of each of said flexible tubes, a collecting reservoir, asurrounding outer rim and an outer perimeter perpendicular to saidsurrounding outer rim; at least one of said first and second end capshaving a passageway connecting to said collecting reservoir forconnection to either of a passageway of another pressure vessel and avalve; each of said receptacles having a surrounding wall, a base and anorifice penetrating said base; said orifice connecting said receptacleto either of said collecting reservoir and said passageway; said wallhaving an interior surface, said interior surface being sized and shapedto fit frictionally over said outer surface of one of said flexibletubes at either of said first and second ends; said collecting reservoirhaving an outer surface and connecting said base of each of saidreceptacles to a common space, said common space being either of closedand connected to said passageway; said surrounding outer rim extendingoutwardly from said outer surface of said collecting reservoir for afirst predetermined distance along said flexible tubes and serving toconstrain said flexible tubes; means for securing said first and secondend caps to said flexible tubes; a valving means, said valving meansbeing capable of controlling a flow of either of a liquid and a gasthrough said passageway and being attached to a distal end of saidpassageway; and whereby, when said flexible tubes are inserted into saidreceptacles of said end caps and secured thereto, a flexible pressurevessel will be formed capable of containing either of a liquid and a gasat high pressure.
 2. A cellular reservoir flexible pressure vessel, asdescribed in claim 1, wherein the means for securing the first andsecond end caps to the flexible tubes is selected from the groupcomprising: radio frequency welding, high-strength adhesive, mechanicalfastening and sonic welding.
 3. A cellular reservoir flexible pressurevessel, as described in claim 1, further comprising: a protruding rim,said protruding rim being disposed at said outer perimeter of said firstand second end caps and upper and lower receiving notches disposed aboveand below said protruding rim; a reinforcing ring, said reinforcing ringhaving an inner surface, an outer surface, being formed of high-strengthmaterial and being sized and shaped to fit tightly about the outerperimeter of said end caps; said reinforcing ring having an upper andlower projecting ribs and a central receiving notch disposed betweensaid upper and lower projecting ribs; said projecting ribs being sized,shaped and disposed to fit said upper and lower receiving notches ofsaid end caps; said central receiving notch being sized, shaped anddisposed to fit said protruding rim of said end caps; said reinforcingring having an aperture, said aperture extending from said inner surfaceto said outer surface and being sized, shaped and disposed toaccommodate said passageway of said end caps; whereby, when saidreinforcing ring is disposed about the outer perimeter of said first andsecond end caps, the pressure handling capacity of said pressure vesselis increased.
 4. A cellular reservoir flexible pressure vessel, asdescribed in claim 1, further comprising: a protruding rim; saidprotruding rim being disposed at said outer perimeter of said first andsecond end caps and upper and lower receiving notches, said upper andlower receiving notches being disposed above and below said protrudingrim; upper and lower a reinforcing rings, each of said reinforcing ringshaving an inner surface, an outer surface, being formed of high-strengthmaterial and being sized and shaped to fit tightly in either of saidupper and lower receiving notches; at least one of said reinforcingrings having an aperture, said aperture extending from said innersurface to said outer surface and being sized, shaped and disposed toaccommodate said passageway connecting to said collecting reservoir; andwhereby, when said reinforcing rings are disposed about the outerperimeter of said first and second end caps, the pressure handlingcapacity of said pressure vessel is increased.
 5. A cellular reservoirflexible pressure vessel as described in claim 4, further comprisingmeans for fastening said upper reinforcing ring to said lowerreinforcing ring.
 6. A cellular reservoir flexible pressure vessel, asdescribed in claim 1, further comprising: A protruding rim, saidprotruding rim being disposed at said outer perimeter of said first andsecond end caps; at least one groove disposed about said outer perimeterabove said protruding rim; at least one groove disposed about said outerperimeter below said protruding rim; upper and lower reinforcing rings,each of said reinforcing rings having an inner surface, an outersurface, being formed of high-strength material and being sized andshaped to fit tightly about said outer perimeter on either side of saidprotruding rim; each of said reinforcing rings having at least one ribdisposed upon the inner surface thereof, said rib being sized, shapedand disposed to engage said groove; and whereby, when said reinforcingrings are disposed about the outer perimeter of said first and secondend caps, the pressure handling capacity of said pressure vessel isincreased.
 7. A cellular reservoir flexible pressure vessel as describedin claim 6, further comprising means for fastening said upperreinforcing ring to said lower a reinforcing ring.
 8. A cellularreservoir flexible pressure vessel as described in claim 1, furthercomprising: a sintactic foam filler, said foam filler being disposedwithin said collecting reservoir of at least one of said first andsecond end caps; said foam filler having a series of canalstherethrough, each of said canals connecting said orifice of saidreceptacle to said passageway; an opening in said end caps, said openingproviding means for introduction of said sintactic foam into said endcaps; a sealing plug, said sealing plug being sized and shaped to fitsealably into said opening in said end caps; and whereby, when saidsintactic foam is introduced into said end caps, the pressure handlingcapacity of said pressure vessel is increased.
 9. A cellular reservoirflexible pressure vessel as described in claim 1, further comprising: asintactic foam filler, said foam filler being disposed within saidcollecting reservoir of at least one of said first and second end caps;said foam being penetrated by a series of flexible microtubes, each ofsaid microtubes connecting said orifice of said receptacle to saidpassageway; an opening in said end caps, said opening providing meansfor introduction of said sintactic foam into said end caps; a sealingplug, said sealing plug being sized and shaped to fit sealably into saidopening in said end caps; and whereby, when said microtubes areconnected to the orifices of said receptacles in said end caps, thepurity of either of liquids and gasses stored in said pressure vessel isincreased.
 10. A cellular reservoir flexible pressure vessel, asdescribed in claim 1, further comprising: an overwrapping ofhigh-strength braiding material, said braiding material extending oversaid flexible tubes and said first and second end caps; and whereby,when the flexible pressure vessel is so overwrapped, itspressure-handling capability will be increased.
 11. A cellular reservoirflexible pressure vessel, as described in claim 1, further comprising:hoop winding with high-strength materials, said hoop winding extendingover said flexible tubes and said first and second end caps; andwhereby, when the flexible pressure vessel is so hoop wound, itspressure-handling capability will be increased.
 12. A cellular reservoirflexible pressure vessel, as described in claim 10, further comprising aplastic overcoating, said overcoating further increasing thepressure-handling capability of the pressure vessel.
 13. A cellularreservoir flexible pressure vessel, as described in claim 11, furthercomprising a plastic overcoating, said overcoating further increasingthe pressure-handling capability of the pressure vessel.
 14. A cellularreservoir flexible pressure vessel, as described in claim 1, furthercomprising: a first flexible blanket, said first blanket having an uppersurface, a lower surface and being sized and shaped to cover saidpressure vessel and extending outwardly beyond outer edges thereof; saidfirst blanket being fixedly attached at its lower surface to an uppersurface of said pressure vessel; a second flexible blanket, said secondblanket having an upper surface, a lower surface and being sized andshaped to cover said pressure vessel and extending outwardly beyond saidouter edges; said second blanket being fixedly attached at its uppersurface to a lower surface of said pressure vessel; and whereby, whensaid first and second flexible blankets are attached to said pressurevessel, the pressure handling capability of the pressure vessel will beincreased.
 15. A cellular reservoir flexible pressure vessel asdescribed in claim 14, wherein heavy duty stitching is used to attachthe first blanket to the second blanket, said stitching penetrating thefirst and second blankets and serving to further reinforce and increasethe pressure-handling capabilities of the pressure vessel.
 16. Acellular reservoir flexible pressure vessel as described in claim 15,wherein the heavy duty stitching is high pressure hoop and lockbraiding.
 17. A cellular reservoir flexible pressure vessel, asdescribed in claim 1, wherein the cross-sectional shape of the outersurface of the flexible tubing is selected from the group comprising:square, triangular, round, hexagonal, ovoid, octagonal and star-shaped.18. A cellular reservoir flexible pressure vessel, as described in claim1, wherein the cross-sectional shape of the inner surface of theflexible tubing is selected from the group comprising: square,triangular, round, hexagonal, ovoid, octagonal and star-shaped.
 19. Acellular reservoir flexible pressure vessel, as described in claim 1,wherein the cross-sectional shape of the flexible pressure vessel isselected from the group comprising: square, triangular, round,hexagonal, ovoid, octagonal, pillow shaped, saddle shaped and aflattened mat shape.
 20. A cellular reservoir flexible pressure vessel,as described in claim 1, wherein: each of said receptacles are of aconcave form selected from the group comprising: cylindrical, conical,dome-shaped, ellipsoid and stair-stepped.
 21. A cellular reservoirflexible pressure vessel, as described in claim 20, wherein said firstand second ends of each of said flexible tubes are sized and shaped tofit sealably into said receptacles.
 22. A cellular reservoir pressurevessel as described in claim 1, further comprising: upper and lowerreinforcing panels, said reinforcing panels being formed ofhigh-strength woven material and being shaped as a form to cover atleast half of a surface area of the pressure vessel with extensionsprojecting from a perimeter of said form; and said reinforcing panelsbeing adhered to said outer surface of said pressure vessel, therebyincreasing the pressure handling capability of said pressure vessel. 23.A cellular reservoir flexible pressure vessel as described in claim 22,wherein the method of adhesion is selected from the group comprising:high-strength adhesive, sonic welding and RE welding.
 24. A cellularreservoir flexible pressure vessel as described in claim 22, wherein thewoven material is prepregnated with either of adhesive and laminatingmaterial and subjected to heat and pressure.